Convert Abstract class to Interface in C#

This short article showing you how to convert the Abstract class to Interface in C#.

If in your abstract class you have totally has no implement on any Method like the simple Proxy Design Pattern below then you should convert your Abstract class to become Interface.

using System;

 

namespace DoFactory.GangOfFour.Proxy.Structural

{

    class MainApp

    {

        static void Main()

        {

            // Create proxy and request a service

            Proxy proxy = new Proxy();

            proxy.Request();

 

            // Wait for user

            Console.ReadKey();

        }

    }

 

    abstract class Subject

    {

        public abstract void Request();

    }

 

    class RealSubject : Subject

    {

        public override void Request()

        {

            Console.WriteLine(“Called RealSubject.Request()”);

        }

    }

 

    class Proxy : Subject

    {

        private RealSubject _realSubject;

 

        public override void Request()

        {

            // Use ‘lazy initialization’

            if (_realSubject == null)

            {

                _realSubject = new RealSubject();

            }

 

            _realSubject.Request();

        }

    }

}

Below is the code that convert from Abstract class to Interface.

using System;

 

namespace ConAppProxy

{

    class MainApp

    {

        static void Main()

        {

            // Create proxy and request a service

            Proxy proxy = new Proxy();

            proxy.Request();

 

            // Wait for user

            Console.ReadKey();

        }

    }

 

    interface Subject

    {

        //public abstract void Request();

        void Request();

    }

 

    class RealSubject : Subject

    {

        //public override void Request()

        public void Request()

        {

            Console.WriteLine(“Called RealSubject.Request()”);

        }

    }

 

    class Proxy : Subject

    {

        private RealSubject _realSubject;

 

        public void Request()

        {

            // Use ‘lazy initialization’

            if (_realSubject == null)

            {

                _realSubject = new RealSubject();

            }

 

            _realSubject.Request();

        }

    }

}

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About chanmingman

Since March 2011 Microsoft Live Spaces migrated to Wordpress (http://www.pcworld.com/article/206455/Microsoft_Live_Spaces_Moves_to_WordPress_An_FAQ.html) till now, I have is over 1 million viewers. This blog is about more than 50% telling you how to resolve error messages, especial for Microsoft products. The blog also has a lot of guidance teaching you how to get stated certain Microsoft technologies. The blog also uses as a help to keep my memory. The blog is never meant to give people consulting services or silver bullet solutions. It is a contribution to the community. Thanks for your support over the years. Ming Man is Microsoft MVP since year 2006. He is a software development manager for a multinational company. With 25 years of experience in the IT field, he has developed system using Clipper, COBOL, VB5, VB6, VB.NET, Java and C #. He has been using Visual Studio (.NET) since the Beta back in year 2000. He and the team have developed many projects using .NET platform such as SCM, and HR based applications. He is familiar with the N-Tier design of business application and is also an expert with database experience in MS SQL, Oracle and AS 400.
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